Honour SOURCE_DATE_EPOCH for timestamps in output
compile failed with "--with-metafont"
zooming in multiplots with logscaled and linked axes fails
Showing NaN rather than a coordinate for the secondary axis of a linked pair or nonlinear mapping is an intrinsic limitation of the design. The underlying problem is that the forward and reverse mapping functions must be evaluated by the program core, but during mousing the display window does not necessarily share any context (variables, functions, etc) with the core code. But the error, and the lack of mouse tracking for x, are both bugs. Now fixed in 6.1 and queued for 6.0
'set contourfill defined' causes an error with another keyword
The first one is a misleading error message ('defined' and 'firstlinetype' are mutually exclusive options). The second one is a bug. Fixed in 6.1, pending for 6.0
Memory leaks if commands fail
`local array` at top-level crashes gnuplot silently